Hey, I was once challenged to find the answers to two exercises, on which I had success, but only by the means of trial and error.
Could somebody show me the heuristics to solve them? The exercises are as follows:
There are three balls, labeled A, B and C.One of them is blue, other is white, and the last one is red. Only one of the following propositions is right:
- A is red
- B is not red
- C is not blue
Which are the colors for A, B and C?
Adrian, Bob and Carl all work at the same firm. One of them is a director, other is a secretary, and the last one is a janitor. Bob is the only one who is known for always telling the truth.
-The director said Bob is a secretary
-The secretary said his name is Bob
-The janitor said Adrian is a director.
Which are the positions of Adrian, Bob and Carl in the firm?